Lost creator JJ Abrams has befuddled American movie fans by releasing an untitled film trailer.

The movie has been dubbed ‘Cloverfield', but Paramount Pictures has insisted that the name is merely a working title for the secret project.

The film's script is believed to have been written by Lost's supervising producer Drew Goddard, while Matt Reeves, who previously worked with Abrams on cult US drama series Felicity, is said to be directing.